c - Trigonometric functions are not working in LPC Xpresso IDE -

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I am using LPCXpresso IDE for programming LPC1769, because Core Library CMSISv2p00_LPC17xx is being used. And I chose REDLIB by default.

The problem is facing, that, trigonometry functions are not working, I have included the calculator, it is not showing any errors or warnings, such as sin, cos , Tan and etc. gives zero value always.

Any suggestions and help will be highly appreciated!


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